EP2454289A1 - Polymères hybrides d'amidon - Google Patents

Polymères hybrides d'amidon

Info

Publication number
EP2454289A1
EP2454289A1 EP10736873A EP10736873A EP2454289A1 EP 2454289 A1 EP2454289 A1 EP 2454289A1 EP 10736873 A EP10736873 A EP 10736873A EP 10736873 A EP10736873 A EP 10736873A EP 2454289 A1 EP2454289 A1 EP 2454289A1
Authority
EP
European Patent Office
Prior art keywords
starch
film forming
forming polymer
ethylenically unsaturated
water soluble
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10736873A
Other languages
German (de)
English (en)
Inventor
Gamini S. Samaranayake
Richard F. Tomko
Philip J. Ruhoff
Madhukar Rao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sherwin Williams Co
Original Assignee
Sherwin Williams Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sherwin Williams Co filed Critical Sherwin Williams Co
Publication of EP2454289A1 publication Critical patent/EP2454289A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/02—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to polysaccharides

Definitions

  • the present invention is directed to polymeric resins and resin dispersions suitable for use in the formulation of coatings, sealants, caulks, and adhesives, wherein the resins are substantially derived from biorenewable polysaccharides.
  • the present invention is directed to film forming polymeric resins having particular, but not exclusive utility in formulations for aqueous architectural paints, which incorporate at least 15% by weight, and in other embodiments at least 20% by weight, and in some embodiments, up to about 25% by weight of biorenewable polysaccharides.
  • the present invention also describes one and two-stage polymerization methods for preparing film forming polymeric resins and emulsions comprising such resins. Still further, the present invention describes coating formulations comprising the film-forming binders herein described.
  • the binders or resins of the present invention may be formed by the emulsion polymerization of a monomer mixture comprising (a) one or more low molecular weight polysaccharides, which in some embodiments may be hydrophobically modified, with (b) one or more conventional, ethylenically unsaturated monomers.
  • a monomer mixture comprising (a) one or more low molecular weight polysaccharides, which in some embodiments may be hydrophobically modified, with (b) one or more conventional, ethylenically unsaturated monomers.
  • Various emulsion polymerization processes described in further detail below, may be employed to formulate the binders herein described.
  • a hydrophobically modified polysaccharide may be formed in situ as the reaction product of one or more water soluble polysaccharides and an ethylenically unsaturated monomer blend comprising hydrophilic and hydrophobic ethylenically unsaturated monomers, preferably in conjunction with a water soluble chain transfer agent.
  • Suitable water soluble polysaccharides may have a solubility of greater than about 30 weight percent and may include low molecular weight unmodified starch or low molecular weight starch modified to enhance water solubility.
  • the low molecular weight polysaccharides of the present invention will most usefully have a number average molecular weight of between about 1000 and about 80000, and still more usefully, between about 1000 and about 60000. However, polysaccharides having molecular weights between about 1,000 and about 100,000, with polysaccharides having a molecular weight of between about 3,000 to about 80,000 may be useful in some embodiments. Low molecular weight polysaccharides, such as starch, having a molecular weight less than about 60,000, tend to be water soluble.
  • polysaccharide includes starch; namely amylose and amylopectin, and dextrins derived from the processing of starch, including maltodextrins and cyclodextrins.
  • Polysaccharides may also include cellulosic materials such as microbial polysaccharides, and water soluble cellulose fragments generated by hydrolysis of fiber, and plant gums; hemicellulose, Guar gums and gum Arabic.
  • Starch is a particularly useful polysaccharide. Starch may be degraded into lower molecular weight dextrins enzymatically, by hydrolysis and/or by thermal degradation. Suitable starches may be obtained from many readily available and biorenewable sources, such as corn, wheat, potatoes, and rice; however it is not believed that the starch source is vital to the practice of this invention.
  • polysaccharide derivative refers to a polysaccharide that has been selectively modified by the addition of one or more functional groups or other moieties.
  • processes that may be used to create polysaccharide derivatives include oxidation, carboxylation, ethoxylation, propoxylation, alkylation and alkanoylation. Depending on the type of chemistry these modifications may be classified as hydrophobic or hydrophilic.
  • the embodiments of the invention employ a hydrophobically modified polysaccharide, which may be "pre-made” or generated in situ, in the formation of graft-polymer resins.
  • a hydrophobically modified polysaccharide which may be "pre-made” or generated in situ, in the formation of graft-polymer resins.
  • generating starch derivatives having hydrophobic characteristics in parity with that of hydrophobic ethylenically unsaturated monomers, which are to be reacted therewith may yield emulsion polymerization reaction products, such as the resins of the present invention, having a high level of monomer grafting in the starch backbone yielding resins having from 15 to 30% by weight provided by the starch.
  • the high level of polysaccharide incorporation into the polymer resin may be as a result of improved interaction of the polysaccharide derivative, which is or has been rendered more hydrophobic, with oleophilic monomers. .
  • pre-made hydrophobically modified polysaccharide simply refers to a polysaccharide derivative that is generated in a completely separate processing step from the emulsion polymerization employed to generate the polymer resins.
  • available, pre-made hydrophobically modified polysaccharides include the hydroxyalkyl starches, such as hydroxypropyl starch. Hydroxypropyl starch may be prepared by the reaction of starch and propylene oxide.
  • Useful, pre-made hydroxylpropyl starches are commercially available from Grain Processing Corporation. These materials may be procured in the form of an insoluble gel, which may be processed for further suitable use in accordance with the methods of this invention by jet cooking or wet milling the gel to less than 600 micron particle size.
  • Other useful hydrophobically modified starch derivatives may include octenyl maltodextrin.
  • Still other useful hydrophobically modified polysaccharide derivatives may include polysaccharides modified with an activated vinylic functionality such as maleic, fumaric, acrylic, or methacrylic acids.
  • a useful film-forming binder may be formed by the emulsion polymerization reaction product of a mixture comprising one or a blend of hydrophobically modified polysaccharide derivatives and one or a blend of conventional ethylenically unsaturated monomers.
  • Suitable ethylenically unsaturated monomers may include vinyl monomers, acrylic monomers, allylic monomers, acrylamides, acrylonitriles N-vinyl amides, N-allyl amines and their quaternary salts and mono- and dicarboxylic unsaturated acids and vinyl ethers.
  • Vinyl esters may be used and may include vinyl acetate, vinyl propionate, vinyl butyrates, vinyl neodeconate and similar vinyl esters; vinyl halides include vinyl chloride, vinyl fluoride and vinylidene chloride; vinyl aromatic hydrocarbons include styrene, a-methyl styrene, and similar lower alkyl styrenes.
  • hydrophilic, ethylenically unsaturated monomers are those having combined oxygen and nitrogen content greater than 30% by weight.
  • suitable hydrophilic ethylenically unsaturated monomers may include vinyl acetate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide and methacrylamide, hydroxyethyl acrylate, N-methylacrylamide, N-hydroxymethyl acrylate and methacrylate, dimethylaminoethyl methacrylate, methacryloxyethyl trimethyl ammonium chloride or other monomers that give a water soluble polymer directly or by suitable post reaction.
  • Hydrophobic, ethylenically unsaturated monomers include those having an oxygen and nitrogen content less than 30% by weight.
  • suitable hydrophobic ethylenically unsaturated monomers may include, methyl methacrylate, methyl acrylate, styrene, alpha-methylstyrene, butyl acrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, lauryl methacrylate, stearyl methacrylate, ethylhexyl methacrylate, crotyl methacrylate, cinnamyl methacrylate, oleyl methacrylate, ricinoleyl methacrylate, vinyl butyrate, vinyl tert-butyrate, vinyl stearate, vinyl laurate, vinyl versitate or other monomers that give a water insoluble polymer.
  • a polymeric binder may be formed as a one-stage emulsion polymerization reaction product of a monomer mixture comprising:
  • the hydrophobically modified polysaccharide may be alkyl, hydroxyalkyl, or alkanoyl derivatives of low molecular weight starch, such as starch octenyl succinate.
  • the molecular weight of the hydrophobically modified polysaccharide derivative may be between about 3000 and about 80000.
  • One or more surfactants/emulsifying agents may be used in the emulsion polymerization. Suitable such agents may include any that are generally used in emulsion polymerization, including, without limitation, anionic surfactants such as alkali or ammonium salt of aliphatic acids, alkylsulfates and phosphates having a C 8 - Ci 8 alkyl residue, alkyl polyether sulfates and phosphates having a C 8 -Cj 8 alkyl residue and alkyl phenol ethoxylates of C 8 -Cj 2 alkyl residues sodium dodecylbenzenesulfonate; cationic surfactants such as cetyltrimethylammonium bromide, and dodecylamine chloride; nonionic surfactants such as alkylphenyl polyethers having a C 8 -Cj 2 alkyl residue, and and alkyl polyether having a C 8 -Cj 8 alkyl residues
  • a free radical initiator may be used.
  • the free radical initiator may be any of those conventionally used in emulsion polymerization processes, including, without limitation persulfates or organic peroxides such as potassium persulfate, and ammonium persulfate, cumene hydroperioxide, benzoyl peroixde; redox initiators such as those comprising a persulfate or organic peroxide with a reducing agent such as ferrous sulfate, and sodium sulfite, and the like.
  • the initiator may be used in amounts ranging from about 0.01% to about 6% with respect to total monomer weight.
  • DAAM diacetone acrylamide
  • AAEM acetylacetoxyethylmethacrylate
  • Particularly useful are light-curing crosslinking agents, such as benzophenones, benzothizoles. Camphor quinone and fulvenes modified resins.
  • the agents may be used in amounts of about 3 to about 6% with respect to total monomer weight.
  • the just described embodiment may be referred to herein as a one-stage emulsion polymerization to distinguish it from the two-stage emulsion polymerization process described in further detail below.
  • the one-stage emulsion polymerization uses as a starting material in the monomer mixture, a hydrophobically modified polysaccharide derivative, such as an alkyl, hydroxyalkyl, or alkanoyl starch derivative.
  • a hydrophobically modified polysaccharide derivative such as an alkyl, hydroxyalkyl, or alkanoyl starch derivative.
  • the polysaccharide starting material be hydrophobically modified, but it is necessary that the polysaccharide is water soluble, being at least 30 weight percent soluble.
  • the material may be an unmodified low molecular weight polysaccharide, or a derivative thereof that has been modified to increase water solubility, which is hydrophobically modified in situ during stage one of the polymerization, with subsequent polymer growth occurring in a second polymerization stage.
  • the polymer resulting from the one-stage emulsion polymerization will preferably have from about 5 to about 60% by weight (with respect to total polymer weight) derived from the hydrophobically modified starch starting material, and in some embodiments, greater than about 15% by weight of the polymer reaction product will be contributed by the polysaccharide, and in still further embodiments, greater than 20% by weight.
  • a resin having high levels of incorporated polysaccharide may be generated as the reaction product of a monomer mixture comprising a low molecular weight, water soluble starch that is hydrophobically modified in situ, thus allowing for the use of lower cost, unmodified starches, such as low molecular weight dextrin, as starting materials in place of the pre-made hydrophobically-modified starch derivatives used in the one-stage polymerization process discussed above.
  • a two-stage emulsion polymerization process may be employed, in which, during the first stage, hydrophobically modified starch derivatives are generated in situ as the emulsion polymerization reaction product of water soluble starch, such as a low molecular weight dextrin, and a blend of ethylenically unsaturated monomers, which may, in some embodiments, depending on the relative water solubility of the hydrophilic monomers used, comprise from about 1 to about 10% by weight hydrophilic, ethylenically unsaturated monomers, and in some embodiments, about 10% by weight hydrophilic ethylenically unsaturated monomers and in other embodiments, greater than 10% by weight up to about 50% by weight.
  • polymerization commences in the water phase.
  • substantially all the starch may be charged to the reaction chamber containing water, with a blend of ethylenically unsaturated monomers, comprising from 1 to about 10% by weight of hydrophilic, ethylenically unsaturated monomers, to yield a monomer mixture in which approximately 60 to 95%, and preferably about 75 to 85% of the monomer mass is starch and the remaining 5 to 40%, and preferably 15 to 25% of the monomer mass is the blend of ethylenically unsaturated monomers.
  • a particularly useful blend of ethylenically unsaturated monomers, for at least stage one polymerization may comprise at least 1% hydrophilic ethylenically unsaturated monomers.
  • Particularly useful hydrophilic monomers of this type include poly(propyleneglycol)acrylates and methacrylates, poly(ethyleneglycol)acrylates and methacrylates, and their corresponding Cj to C 2 alkyl ethers. .
  • the mixture may comprise methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate and one or more vinyl alkanoates: such as vinyl acetate and vinyl versetate.
  • the ethylenically unsaturated monomer mixture comprises vinyl acetate, which has sufficient water solubility to enter into a water-phase free radical grafting reaction that transforms starch molecules into hydrophobic nucleating sites.
  • Vinyl acetate also has a high chain transfer activity so that the use of an additional water soluble chain transfer agent is unnecessary.
  • the polymerization reaction may be initiated by addition of a suitable water-soluble initiator.
  • a suitable water-soluble initiator One or more surfactants and free radical initiators, such as those described previously, may be used in stage one polymerization.
  • the entire mixture may be blended at an elevated temperature, which may be about 80 0 C.
  • the pH of the mixture may be modified or neutralized as desirable by the addition of suitable base, such as sodium carbonate.
  • a suitable amount of a chain transfer agent may be used, ensuring chain transfer to the polysaccharide backbone.
  • Water soluble chain transfer agents are particularly useful. Use of chain transfer agents enhances the number of grafting positions created along the backbone and limits the formation of long graft chains.
  • Suitable chain transfer agents may include carbon tetrachloride, bromoform, organic trithiocarbonates, organic dithiocarbonates, and organic xanthates, and mercaptans, such as alkyl or aralkyl mercaptans having about 2 to 20 carbons.
  • Particularly useful chain transfer agents may include 2-mercaptoethanol and -n-dodecylmercaptan. Desirably, the chain transfer agent is employed in an amount from about 0.1 percent to about 0.6% by weight, preferably from about 0.1 to about 0.3% by weight based on reacted monomer weight. In some instances, ethylenically unsaturated monomers employed in the monomer mixture, such as vinyl acetate, can act as the chain transfer agent.
  • all or a portion of the chain transfer agent(s) and other additives may be blended into the first and/or second monomer mixture feeds.
  • the second monomer mixture feed may be delivered over a period of one to three hours, though longer or shorter times may be employed.
  • Stage two polymerization may be commenced after stage one polymerization with a rest period between stage one and stage two polymerization of at least about 10 to about 30 minutes.
  • a redox chase may be employed following stage two polymerization to substantially rid the emulsion product of excess monomer.
  • Suitable oxidizers may include ammonium persulfate, cumene hydroperoxide, t-butyl hydroperoxide, hydrogen peroxide, potassium persulfate, and sodium persulfate.
  • Suitable reducers may include sodium metabisulfite, sodium thiosulfate, sodium formaldehyde sulfoxylate, sodium hydrosulfite, sodium bisulfite, hydroxymethanesulfonic acid, iron (II) sulfate, formic acid, ammonium bisulfate, lactic acid, ascorbic acid, and isoascorbic acid.
  • the pH of the final emulsion may be adjusted to between about 6 and about 8.5.
  • the first and second ethylenically unsaturated monomer mixtures may have substantially the same relative ratios of individual monomer species and/or substantially the same ratios of hydrophilic to hydrophobic ethylenically unsaturated monomers.
  • the weight percent of hydrophilic monomers may be between about 1 and about 10%. Whether the monomer blend of the first and second ethylenically unsaturated monomer mixtures is the same or not, it is generally useful for at least the first of these monomer mixtures to comprise at least 1 weight percent of hydrophilic species.
  • the unmodified starch will preferably comprise between about 15 and about 25% by weight with respect to total monomer weight. Higher levels of starch incorporation may be possible.
  • the remaining monomer weight may be supplied by the ethylenically unsaturated monomers. Of the latter, it is useful in some embodiments for 1 to about 50% of the ethylenically unsaturated monomers to be fed into the reaction chamber in the first polymerization stage, preferably about 5 to about 15%.
  • Reaction products from the two-stage emulsion polymerization embodiments outlined above may include polymeric binders comprising from about 30 to about 60% by weight, with respect to total polymer weight, derived from polysaccharide starting materials.
  • the above polymer can be used by itself as a sole binder, or in combination with a latex as a film forming resin in coating compositions.
  • the polymer may also be useful in adhesive, caulk and sealant compositions.
  • latex compositions in which the polymer products of the present invention may be blended include, for example, those based on resins or binders of vinyl acrylic, styrene acrylic, all acrylic, copolymers of acrylonitrile wherein the comonomer may be a diene like isoprene, butadiene or chloroprene, homopolymers and copolymers of styrene, homopolymers and copolymers of vinyl halide resins such as vinyl chloride, vinylidene chloride or vinyl esters such as vinyl acetate, vinyl acetate homopolymers and copolymers, copolymers of styrene and unsaturated acid anhydrides like maleic anhydrides, homopolymers
  • the coatings of this invention may typically be applied to any substrate such as metal, plastic, wood, paper, ceramic, composites, dry wall, and glass, by brushing, dipping, roll coating, flow coating, spraying or other method conventionally employed in the coating industry.
  • Opacifying pigments that include white pigments such as titanium dioxide, zinc oxide, antimony oxide, etc. and organic or inorganic chromatic pigments such as iron oxide, carbon black, phthalocyanine blue, etc. may be used.
  • the coatings may also contain extender pigments such as calcium carbonate, clay, silica, talc, etc.
  • Example 1 demonstrates that there was substantially no grafting onto the starch backbone in the absence of a chain transfer agent or hydrophilic, ethylenically unsaturated monomers. Importantly, a dry film of the resin exhibited poor scrub resistance after only 115 cycles under a binder/TiO2 Screen Test (24 Hr dry).
  • Example 2 To evaluate the effect incorporating a non-water-soluble chain transfer agent would have on the grafting of hydrophobic, ethylenically unsaturated monomers onto a starch backbone, 733g of starch (M. W. 46000) was dissolved in water heated at 70° C in a five neck 5 L flask fitted with overhead stirrer, thermometer, nitrogen inlet, condenser and feeding port. The solution was purged with nitrogen for 10 minutes and, a mixture of surfactants (Polystep B-23 and Igepal CO-897) was added. The solution was heated to 80 0 C.
  • a mixture of surfactants Polystep B-23 and Igepal CO-897
  • An initial initiator charge of 0.42g of sodium persulfate was added, followed by approximately 10 % of a monomer mixture comprising 623g of methyl methacrylate and 912g of butyl acrylate.
  • 46.73g of an emulsifier (Igepal CO-897), 4.45g of a water insoluble chain transfer agent (N- dodecylmercaptan) and 0.24g of sodium carbonate were added in that order.
  • the remaining monomer mixture and a solution of 13.3g of sodium persulfate and 1.98g of sodium carbonate in 30g water were concurrently fed into the reaction vessel via separate streams over a 2 hour time period.
  • the temperature was lowered to 70° C to feed 70%- tert-butyl hydroperoxide (2.2g in 18g of water), and ascorbic acid (3.3g in 25g water and 2.12g 30% sodium hydroxide) for 1 hour. After an additional 1-hour hold, the batch was cooled. The pH was adjusted to about 8.5 by addition of sodium hydroxide.
  • the starch content of the resultant polymer resin was approximately 6 weight %. It is believed that the lack of hydrophilic chain transfer agent and monomers resulted in starch backbones having very long acrylic chains, which imparted poor stability to the resin. The resulting resin gelled within 1 month.
  • the initial initiator charge sodium persulfate, 0.42g
  • approximately 10 % of a monomer mixture comprising 623g of methyl methacrylate and 912g of butyl acrylate.
  • 4.45g of a water-soluble chain transfer agent (2-mercaptoethanol) and 0.54g of sodium carbonate were added in that order.
  • the remaining monomer mixture and a solution of 4.45g of sodium persulfate and 0.5g of sodium carbonate in 38g water were concurrently fed into the reaction vessel via separate streams over a 2 hour time period.
  • the temp was lowered to 70° C to feed 70%- tert- butyl hydroperoxide (2.2g in 18g of water), and ascorbic acid (3.3g in 25g water and 2.12g 30% sodium hydroxide) for 1 hour. After an additional 1 hour hold, the batch was cooled.
  • the starch content of the resultant polymer resin was approximately 15 weight %.
  • Example 4 To evaluate the effect incorporating a water-soluble chain transfer agent would have on the grafting of hydrophobic, ethylenically unsaturated monomers onto hydrophobically modified starch, 70 Ig of a hydrophobically modified starch (starch octenyl succinate) was dispersed in water heated at 70 ° C in a five neck 3 L flask fitted with overhead stirrer, thermometer, nitrogen inlet, condenser and feeding port. The solution was purged with nitrogen for 10 minutes and, a mixture of surfactants (Hg of Polystep B-23 and 4.3g of Rhodasurf BC-840 4.3g) was added. The solution was heated to 80 C.
  • a hydrophobically modified starch starch octenyl succinate
  • the temperature was lowered to 70° C to feed 70%- tert-butyl hydroperoxide (0.9g in 32g of water), and a mixture of ascorbic acid (1.35g) and 30% sodium hydroxide (0.89g) in 23g water) over 1 hour. After an addition 1 hour hold, the batch was cooled, pH adjusted, and filtered. The starch content of the resultant polymer resin was approximately 16 weight %.
  • Example 6 To evaluate the effect of using vinyl acetate as a hydrophilic monomer component and water soluble chain transfer agent on the grafting of hydrophobic, ethylenically unsaturated monomers onto a starch backbone, 488g of starch (M. W. 46000) was dissolved in water heated at 70° C in a five neck 5L flask fitted with overhead stirrer, thermometer, nitrogen inlet, condenser and feeding port. The solution was purged with nitrogen for 3 minutes and a mixture of surfactants (Polystep B-23 and defoamer DEE215) was added.
  • 488g of starch M. W. 46000

Abstract

Des polymères filmogènes issus sensiblement de polysaccharides bio-renouvelables peuvent être formés en tant que produits de polymérisation en émulsion d'un mélange de polysaccharides hydrophobes et de monomères à insaturation éthylénique. Les polysaccharides hydrophobes peuvent être préparés en tant que produit de réaction en émulsion d'un polysaccharide soluble dans l'eau et d'un mélange de monomères à insaturation éthylénique, hydrophiles, et de monomères à insaturation éthylénique, hydrophobes, en présence d'un agent de transfert de chaîne soluble dans l'eau.
EP10736873A 2009-07-14 2010-07-14 Polymères hybrides d'amidon Withdrawn EP2454289A1 (fr)

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US22530109P 2009-07-14 2009-07-14
PCT/US2010/001969 WO2011008272A1 (fr) 2009-07-14 2010-07-14 Polymères hybrides d'amidon

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US (1) US20110021734A1 (fr)
EP (1) EP2454289A1 (fr)
BR (1) BR112012001084B1 (fr)
CA (1) CA2768302C (fr)
MX (1) MX2012000638A (fr)
WO (1) WO2011008272A1 (fr)

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CA2768302C (fr) 2015-05-05
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BR112012001084B1 (pt) 2020-02-04
BR112012001084A2 (pt) 2016-02-16
MX2012000638A (es) 2012-04-30
US20110021734A1 (en) 2011-01-27

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